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INVESTMENT SECURITIES - Held to maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Mar. 31, 2022
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INVESTMENT SECURITIES |  |
Amortized Cost | $ 247,147 | $ 253,100
Gross Unrealized Losses | (37,414) | (17,071)
Estimated Fair Value | 209,733 | 236,029
Municipal securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 10,350 | 10,368
Gross Unrealized Losses | (3,244) | (1,422)
Estimated Fair Value | 7,106 | 8,946
Agency securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 53,896 | 45,277
Gross Unrealized Losses | (5,887) | (2,450)
Estimated Fair Value | 48,009 | 42,827
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 36,008 | 39,394
Gross Unrealized Losses | (5,346) | (2,457)
Estimated Fair Value | 30,662 | 36,937
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 126,271 | 137,343
Gross Unrealized Losses | (19,254) | (8,883)
Estimated Fair Value | 107,017 | 128,460
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Amortized Cost | 20,622 | 20,718
Gross Unrealized Losses | (3,683) | (1,859)
Estimated Fair Value | $ 16,939 | $ 18,859

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- Definition Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563 + Details
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